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Norm
ISO 7873:1993
Issue date: 1993 12 23
Control charts for arithmetic average with warning limits
Specifies procedures for the statistical control of processes by using control charts based on calculating the arithmetic average of a sample and using warning limits and...
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Withdrawn
: 2014 12 10
Publisher:
International Organization for Standardization
Format:
Digital | 13 Pages
Language:
English
ICS
Specifies procedures for the statistical control of processes by using control charts based on calculating the arithmetic average of a sample and using warning limits and action limits. It is assumed that for large lots and for the mass output of piece and batch production, such a measure of quality is a random variable following a normal distribution. However, when averages of four or more items are plotted, this assumption of a normal distribution is not necessary for control purposes.